﻿Public Class NhapSo

    Private Sub tb_nhapso_KeyPress(ByVal sender As System.Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles tb_nhapso.KeyPress
        If Not Char.IsNumber(e.KeyChar) And Not Char.IsControl(e.KeyChar) Then
            e.Handled = True
        End If
    End Sub
End Class
